private static NavigateToMatchKind GetNavigateToMatchKind(
bool containsDots, PatternMatches matchResult)
{
// NOTE(cyrusn): Unfortunately, the editor owns how sorting of NavigateToItems works,
// and they only provide four buckets for sorting items before they sort by the name
// of the items. Because of this, we only have coarse granularity for bucketing things.
//
// So the question becomes: what do we do if we have multiple match results, and we
// need to map to a single MatchKind.
//
// First, consider a main reason we have multiple match results. And this happened
// when the user types a dotted name (like "Microsoft.CodeAnalysis.ISymbol"). Such
// a name would match actual entities: Microsoft.CodeAnalysis.ISymbol *and*
// Microsoft.CodeAnalysis.IAliasSymbol. The first will be an [Exact, Exact, Exact]
// match, and the second will be an [Exact, Exact, CamelCase] match. In this
// case our belief is that the names will go from least specific to most specific.
// So, the left items may match lots of stuff, while the rightmost items will match
// a smaller set of items. As such, we use the last pattern match to try to decide
// what type of editor MatchKind to map to.
if (containsDots)
{
var lastResult = matchResult.CandidateMatches.LastOrNullable();
if (lastResult.HasValue)
{
switch (lastResult.Value.Kind)
{
case PatternMatchKind.Exact:
return NavigateToMatchKind.Exact;
case PatternMatchKind.Prefix:
return NavigateToMatchKind.Prefix;
case PatternMatchKind.Substring:
return NavigateToMatchKind.Substring;
}
}
}
else
{
// If it wasn't a dotted name, and we have multiple results, that's because they
// had a something like a space separated pattern. In that case, there's no
// clear indication as to what is the most important part of the pattern. So
// we make the result as good as any constituent part.
if (matchResult.Any(r => r.Kind == PatternMatchKind.Exact))
{
return NavigateToMatchKind.Exact;
}
if (matchResult.Any(r => r.Kind == PatternMatchKind.Prefix))
{
return NavigateToMatchKind.Prefix;
}
if (matchResult.Any(r => r.Kind == PatternMatchKind.Substring))
{
return NavigateToMatchKind.Substring;
}
}
return NavigateToMatchKind.Regular;
}